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ASIL tailoring on functional safety requirements

: Fockel, M.


Skavhaug, Amund (Ed.):
Computer safety, reliability, and security. SAFECOMP 2016 : Workshops, ASSURE, DECSoS, SASSUR, and TIPS, Trondheim, Norway, September 20, 2016; Proceedings
Cham: Springer International Publishing, 2016 (Lecture Notes in Computer Science 9923)
ISBN: 978-3-319-45479-5 (Print)
ISBN: 978-3-319-45480-1 (Online)
International Conference on Computer Safety, Reliability, and Security (SAFECOMP) <35, 2016, Trondheim>
International Workshop on Cyber-Physical Systems and Systems-of-Systems (DECSoS) <11, 2016, Trondheim>
Conference Paper
Fraunhofer IEM ()

Cyber-physical systems like self-driving cars are highly complex and safety-critical. This results in a great number of safety requirements that have different levels of criticality. In automotive, the criticality is categorized in Automotive Safety Integrity Levels (ASIL). As a high ASIL causes high development effort, the goal is to develop most subsystems with lower ASIL requirements. To achieve this ASIL tailoring, subsystems need to be separated or redundantly implemented. These safety measures are usually integrated late in the development process and thus cause costly development iterations. In this paper, we present a systematic, tool-supported ASIL tailoring process for the requirements analysis phase. It is applied on formal safety requirements and automatically generated fault trees for a functional view of the system. The process supports early planning of safety efforts for mixed-criticality systems and avoids costly late development iterations.